The tear down effectively reveals the presence of ST's 32bit Microcontroller STM32F401. This IC has been recently announced publicly to the mass market too . It seems here Samsung was able to be an early adopter of this new microcontroller ..

This is a very nice informative teardown of a two quad core professor device, Samsung had really put too many features in a small and lighter device, I was wondering that that Galaxy has 3GB or memory and the article speaks that it has 3Gbit of memory, does it has 8 different slices of 3Gbit or it is something different?